Toyota Corolla Cross: Hybrid/EV Battery Positive Contactor Circuit Short to Ground (P0AD911)

Toyota Corolla Cross (2022-2026) Service Manual / Engine & Hybrid System / Hybrid / Battery Control / Hybrid Control System / Hybrid/EV Battery Positive Contactor Circuit Short to Ground (P0AD911)

DESCRIPTION

The SMRs (System Main Relays) are the relays that connect or disconnect the high-voltage system in accordance with commands from the hybrid vehicle control ECU.

There are 2 SMRs. SMRB and SMRG are located in the HV battery junction block assembly.

To shut off the high voltage power system, SMRB and SMRG are turned off.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	Warning Indicate	Note
P0AD911	Hybrid/EV Battery Positive Contactor Circuit Short to Ground	Short to ground in the SMRB circuit: Primary circuit of SMR (+) is malfunctioning. (2 trip detection logic)	Wire harness or connector HV battery junction block assembly Hybrid vehicle control ECU	Does not come on	Master Warning: Comes on	SAE Code: P0ADB

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Warning Indicate

Note

P0AD911

Hybrid/EV Battery Positive Contactor Circuit Short to Ground

Short to ground in the SMRB circuit:

Primary circuit of SMR (+) is malfunctioning.

(2 trip detection logic)

Wire harness or connector
HV battery junction block assembly
Hybrid vehicle control ECU

Does not come on

Master Warning:

Comes on

SAE Code:

P0ADB

CONFIRMATION DRIVING PATTERN

HINT:

After repair has been completed, clear the DTC and then check that the vehicle has returned to normal by performing the following All Readiness check procedure.

Click here

Connect the GTS to the DLC3.
Turn the ignition switch to ON and turn the GTS on.
Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
Turn the ignition switch off and wait for 2 minutes or more.
Turn the ignition switch to ON (READY) and wait for 30 seconds or more.
Turn the ignition switch off and wait for 2 minutes or more.
Turn the ignition switch to ON and turn the GTS on.
Enter the following menus: Powertrain / Hybrid Control / Utility / All Readiness.
Check the DTC judgment result.
HINT:
- If the judgment result shows NORMAL, the system is normal.
- If the judgment result shows ABNORMAL, the system has a malfunction.
- If the judgment result shows INCOMPLETE, perform driving pattern again.

WIRING DIAGRAM

Refer to the wiring diagram for the HV Battery High-voltage Line Circuit.

Click here

CAUTION / NOTICE / HINT

CAUTION:

Refer to the precautions before inspecting high voltage circuit.

Click here

NOTICE:

After the ignition switch is turned off, there may be a waiting time before disconnecting the negative (-) auxiliary battery terminal.
Click here
When disconnecting and reconnecting the auxiliary battery
HINT:

When disconnecting and reconnecting the auxiliary battery, there is an automatic learning function that completes learning when the respective system is used.

Click here

HINT:

If DTC P0AD911 is output, the ignition switch cannot be turned to ON (READY).

PROCEDURE

1.	CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - BODY GROUND)

(a) Disconnect the hybrid vehicle control ECU connector.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition
I249-3 (SMRB) - Body ground	Ignition switch off	20.6 to 40.8 Ω

REPLACE HYBRID VEHICLE CONTROL ECU

2.	CHECK CONNECTOR CONNECTION CONDITION (FLOOR WIRE CONNECTOR)

Click here

Result	Proceed to
OK	A
NG (The connector is not connected securely.)	B
NG (The terminals are not making secure contact or are deformed, or water or foreign matter exists in the connector.)	C

CONNECT SECURELY

REPAIR OR REPLACE HARNESS OR CONNECTOR

3.	CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - HV BATTERY JUNCTION BLOCK ASSEMBLY)

CAUTION:

Be sure to wear insulated gloves.

(a) Check that the service plug grip is not installed.

NOTICE:

After removing the service plug grip, do not turn the ignition switch to ON (READY), unless instructed by the repair manual because this may cause a malfunction.

(b) Disconnect the HV battery junction block assembly connector.

(d) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition
I249-3 (SMRB) or O212-4 (SMRB) - Body ground and other terminals	Ignition switch off	10 kΩ or higher

(e) Reconnect the hybrid vehicle control ECU connector.

(f) Reconnect the HV battery junction block assembly connector.

REPLACE HV BATTERY JUNCTION BLOCK ASSEMBLY

REPAIR OR REPLACE HARNESS OR CONNECTOR

SEE MORE:

Lost Communication With Hybrid Powertrain Control Module Missing Message (U029387)

DESCRIPTION The ECM and hybrid vehicle control ECU assembly send and receive signals via CAN communication. If a communication error occurs between the ECM and hybrid vehicle control ECU assembly, the ECM illuminates the MIL and stores this DTC. DTC No. Detection Item DTC Detection Co

Electronic Brake Booster Motor "A" Current Sensor Circuit Voltage Out of Range (C13BA1C)

DESCRIPTION When the motor current sensor inside the electric brake booster (brake booster with master cylinder assembly) meets the detection conditions, this DTC is stored. DTC No. Detection Item DTC Detection Condition Trouble Area MIL

Toyota Corolla Cross: Hybrid/EV Battery Positive Contactor Circuit Short to Ground (P0AD911)

READ NEXT:

Hybrid/EV Battery Positive Contactor Circuit Short to Auxiliary Battery or Open (P0AD915)

Hybrid/EV Battery Negative Contactor Circuit Short to Ground (P0ADD11)

Hybrid/EV Battery Negative Contactor Circuit Short to Auxiliary Battery or Open (P0ADD15)

SEE MORE:

Lost Communication With Hybrid Powertrain Control Module Missing Message (U029387)

Electronic Brake Booster Motor "A" Current Sensor Circuit Voltage Out of Range (C13BA1C)